CN205280823U - Impedance of traction electric net work online test device - Google Patents
Impedance of traction electric net work online test device Download PDFInfo
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- CN205280823U CN205280823U CN201520978354.3U CN201520978354U CN205280823U CN 205280823 U CN205280823 U CN 205280823U CN 201520978354 U CN201520978354 U CN 201520978354U CN 205280823 U CN205280823 U CN 205280823U
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Abstract
The utility model discloses an impedance of traction electric net work online test device belongs to electric Railway and pulls power supply technical field. The problem of pull the net short -circuit impedance online test is solved. A current generator CG1's isolator K1's one end links to each other through the one end that current transformer CT1 and PWM converter AD1 exchanged the port, and voltage transformer PT 1 connects in parallel on PWM converter AD1 port, and voltage transformer PT 1's measuring junction, current transformer CT1's measuring junction, PWM converter AD1's control end is connected with controller CU1, and controller CU1 links to each other with internet IT. Connect the one end that exchanges the port in PWM converter AD2 after two CG2's of current generator pantograph EB, isolator K2, current transformer CT2 establish ties, voltage transformer PT 2 connects in parallel on PWM converter AD2 exchanges the port, and voltage transformer PT 2's measuring junction, current transformer CT2's measuring junction, PWM converter AD2's control end is connected with controller CU2, and controller CU2 links to each other with internet IT. Mainly used impedance of traction electric net work online test.
Description
Technical field
The utility model belongs to electric railway traction power supply technique field, in particular to the online test of the normal Traction networks impedance run.
Background technology
The Traction networks of electric railway is made up of contact system and rail; wherein rail impedance for curent change present between certain non-linear and rail and the earth electrically parameter by the complicacy of weather effect; accurate design, calculating Traction networks impedance and earth current distribution is made to become difficulty; and then the accuracy that Traction networks protection seting and fault demarcate (therefore mark) will be difficult to guarantee with reliability, thus affect the safety and reliability of operation. In order to verify protection and event target accuracy and reliability, on the basis of design calculation, also to be carried out on-the-spot short-circuit test. The advantage that on-the-spot short-circuit test has its accuracy high, but short-circuit test process is uncontrollable, and contact system and electric substation's equipment also can be damaged by excessive short-circuit current, and short-circuit test needs to interrupt normal power supply and driving, causes line outage. Therefore, the round-the-clock short-circuit test that will complete various meteorological conditions, to obtain both being subject to the restriction of organization of driving, power scheduling aspect by its short circuit impedance data affected, also to be paid the cost of line outage.
The application discloses a kind of the Traction networks impedance online testing device and the testing method thereof that do not affect normal power supply and driving, it is possible to easily and flexibly, round-the-clock utilization.
Practical novel content
The purpose of this utility model is to provide a kind of Traction networks impedance online testing device, and it can effectively solve the online test problem of the electric railway traction net short circuit impedance of normal operation.
The technical scheme that practical its technical problem of novel solution adopts is: a kind of Traction networks impedance online testing device, and the Traction networks tested is made up of contact system T and rail R, and contact system T is connected with traction bus TB through feeder line F and feeder current mutual inductor CT. Current generator one CG1 being arranged in Operation Van one comprises isolator K1, Current Transmit 1, PWM converter AD1, voltage transformer pt 1 and controller CU1, one end that wherein one end of isolator K1 exchanges port through Current Transmit 1 with PWM converter AD1 is connected, voltage transformer pt 1 is parallel on PWM converter AD1 port, the measuring junction of voltage transformer pt 1, the measuring junction of Current Transmit 1, the control end of PWM converter AD1 are connected with controller CU1, and controller CU1 is connected with internet IT. Current generator two CG2 being arranged in Operation Van two comprises pantograph EB, isolator K2, Current Transmit 2, PWM converter AD2, voltage transformer pt 2 and controller CU2, wherein pantograph EB, isolator K2, Current Transmit 2 are connected to one end that PWM converter AD2 exchanges port after connecting, voltage transformer pt 2 is parallel to PWM converter AD2 and exchanges on port, the measuring junction of voltage transformer pt 2, the measuring junction of Current Transmit 2, the control end of PWM converter AD2 are connected with controller CU2, and controller CU2 is connected with internet IT.
Described current generator one CG1 forms loop through traction bus TB, feeder line F, feeder current mutual inductor CT, contact system T and current generator two CG2 and rail R.
Described current generator two CG2 can also utilize the reserve capacity of locomotive or motor train traction to realize the function of current generator two CG2.
A kind of Traction networks impedance online testing device, test process is as follows: Operation Van one is statically placed in traction bus TB place, the other end of the isolator K1 of its current generator one CG1 is connected to traction bus TB, the other end that its PWM converter AD1 exchanges port is connected to rail R, and the measuring junction of feeder current mutual inductor CT is connected to controller CU1. In Operation Van two, the pantograph EB of current generator two CG2 rises and touches contact system T, and the other end that its PWM converter AD2 exchanges port is connected to rail R through wheel, and Operation Van two moves along Traction networks. The PWM converter AD2 of controller CU2 control current generator two CG2 produces to be the electric current of f close to the frequency that power frequency 50Hz does not obscure with power frequency 50Hz again and is injected on Traction networks. Simultaneously, it is the electric current of f that Current Transmit 2 measures the frequency being injected into Traction networks, it is the voltage of f about the frequency on pantograph EB that voltage transformer pt 2 measures PWM converter AD2 exchange port, and by controller CU2, this electric current, voltage data are sent to internet IT. It is the electric current of f that the PWM converter AD1 of controller CU1 control current generator one CG1 absorbs the frequency of equivalent from Traction networks. Meanwhile, the frequency measured on traction bus TB through voltage transformer pt 1 is the voltage of f. It is electric current, the voltage data of f from the frequency that IT reception controller CU2 in internet sends by controller CU1; The current data that the frequency that the current data that local frequency is f is sent with the controller CU2 received is f is carried out synchronous by controller CU1, namely to clock. Be that on the voltage of f and pantograph EB, frequency is the difference in voltage of f and frequency according to the upper frequency of traction bus TB after synchronous it is the electric current of f, the Traction networks impedance under calculating frequency f, then the Traction networks impedance converted out under power frequency. Controller algorithm is as follows:
The first step, the PWM converter AD2 controlling current generator two CG2 by controller CU2 send amplitude that frequency is f between minimum value and maximum value by specifying, the electric current of evident regularity change and inject Traction networks, wherein the period of change Tp of current amplitude sends data to, much larger than controller CU2, the time �� T that controller CU1 receives data.
2nd step, at moment t, if it is x that current generator two CG2 leaves the distance of current generator one CG1, the frequency that controller CU2 record current mutual inductor CT2 measures is the electric current I of fM(x, t), the frequency that recording voltage mutual inductor PT2 measures simultaneously is the voltage U of fM(x, t), and by this electric current IM(x, t) and this voltage UM(x, t) data are sent to internet IT.
3rd step, coexists moment t, and on the Traction networks that controller CU1 record feeder current mutual inductor CT detects, frequency is the electric current I of fM(x, t), makes current generator one CG1 absorption frequency be the electric current I of fFAnd make electric current IF(0, t)=electric current IM(x, t), the frequency on traction bus that recording voltage mutual inductor PT1 measures simultaneously is the voltage U of fF(0,t)��
4th step, coexists moment t, and controller CU1 receives the electric current I in moment t-�� T that controller CU2 is sent by internet ITM(x, t-�� T) and voltage UM(x, t-�� T) data, according to the feature of the maximum value in the current amplitude Changing Pattern that step one is arranged or minimum value, by electric current IM(x, t-�� T) and electric current IF(0, t-�� T) is synchronous: electric current IM(x, t-�� T)=IF(0, t-�� T); It is the voltage U of f according to frequency on the traction bus TB after synchronousFOn (0, t-�� T) and pantograph EB, frequency is the voltage U of fMDifference and the frequency of (x, t-�� T) are the electric current I of fF(0, t-�� T) calculates the impedance of the Traction networks under frequency f, then the impedance of the Traction networks converted out under power frequency.
Principle of work of the present utility model is: the electric current of two kinds of different frequencies can simultaneously independent work, and is independent of each other. The impedance frequency characteristic assuming Traction networks is continuous print, and the impedance under power frequency (50Hz) can obtain with the impedance conversion under the frequency do not obscured with power frequency 50Hz again close to power frequency 50Hz, or obtains by method of interpolation.
Compared with prior art, the beneficial effects of the utility model are:
One, the online impedance test device of the Traction networks that the utility model proposes can use when not affecting normal power supply and driving.
Two, current generator two CG2 of the present utility model can be arranged separately in Operation Van, the reserve capacity of locomotive or motor train traction can also be utilized to realize the function of current generator two CG2, there is convenience, flexible, safe, controlled feature, and can round-the-clock use.
Three, the utility model advanced technology, reliable, is easy to implement.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the schematic diagram of current generator two CG2 controller CU2 of the present utility model.
Fig. 3 is the schematic diagram of current generator one CG1 controller CU1 of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model will be further described.
Embodiment
Fig. 1 is the structural representation of a kind of embodiment of the present utility model: a kind of Traction networks impedance online testing device, comprises current generator one CG1, current generator two CG2, current generator one CG1 is arranged in Operation Van one, is statically placed in traction bus TB place, current generator two CG2 is installed in Operation Van two, moves along Traction networks, Traction networks is made up of contact system T, rail R, and contact system T is connected with traction bus TB through feeder line F and feeder current mutual inductor CT, current generator one CG1 being arranged in Operation Van one comprises isolator K1, Current Transmit 1, PWM converter AD1 (comprises IGBT single-phase bridge T1 and DC capacitor C1), voltage transformer pt 1 and controller CU1, wherein isolator K1 mono-end is connected to traction bus TB, one end that the other end exchanges port through Current Transmit 1 with PWM converter AD1 is connected, the other end that PWM converter AD1 exchanges port connects rail R, voltage transformer pt 1 is parallel on PWM converter AD1 port, the measuring junction of voltage transformer pt 1, the measuring junction of Current Transmit 1, the control end of PWM converter AD1 is connected with controller CU1, the measuring junction of feeder current mutual inductor CT is also connected with controller CU1, controller CU1 is connected with internet IT, current generator two CG2 being arranged in Operation Van two comprises pantograph EB, isolator K2, Current Transmit 2, PWM converter AD2 (comprises IGBT single-phase bridge T2 and DC capacitor C2), voltage transformer pt 2 and controller CU2, wherein pantograph EB, isolator K2, Current Transmit 2 is connected to one end that PWM converter AD2 exchanges port after connecting, PWM converter AD2 exchanges another termination rail R of port, voltage transformer pt 2 is parallel to PWM converter AD2 and exchanges on port, the measuring junction of voltage transformer pt 2, the measuring junction of Current Transmit 2, the control end of PWM converter AD2 is connected with controller CU2, controller CU2 is connected with internet IT. current generator one CG1 forms loop through traction bus TB, feeder line F, feeder current mutual inductor CT, contact system T and current generator two CG2 and rail R.
Current generator two CG2 can be installed on separately in Operation Van, it is also possible to utilizes the reserve capacity of locomotive or motor train traction to realize the function of current generator two CG2.
Fig. 2 is the current generator two CG2 controller CU2 schematic diagram of the utility model embodiment. the frequency that the PWM converter AD2 generation of controller CU2 control current generator two CG2 is not obscured with power frequency 50Hz again close to power frequency 50Hz is the electric current of f, its amplitude is pressed between minimum value and maximum value and is specified, evident regularity (such as choppy sea etc.) changes, and amplitude period of change Tp sends data to, much larger than controller CU2, the time �� T that controller CU1 receives data, simultaneously measuring, through Current Transmit 2, the frequency that current generator two CG2 is injected into Traction networks is the electric current of f, the voltage that the frequency on pantograph EB is f is measured through voltage transformer pt 2, such as, at moment t, if it is x that current generator two CG2 leaves the distance of current generator one CG1, the frequency that controller CU2 record current mutual inductor CT2 measures is the electric current I of fM(x, t), the frequency that recording voltage mutual inductor PT2 measures simultaneously is the voltage U of fM(x, t), controller CU2 is by this electric current IM(x, t) and this voltage UM(x, t) data are sent to internet IT.
Fig. 3 is the current generator one CG1 controller CU1 schematic diagram that the utility model is implemented. On the PWM converter AD1 absorption Traction networks of controller CU1 control current generator one CG1, the frequency of the equivalent that the PWM converter AD2 of current generator two CG2 sends is the electric current of f; Controller CU1 receives data from internet IT; Controller CU1 is by synchronous with the current data that controller CU2 sends for local current data; According to the impedance that frequency on the traction bus TB after synchronous is the Traction networks under frequency to be the difference in voltage of f and frequency the be Current calculation frequency f of f on the voltage of f and pantograph EB, then the impedance of the Traction networks converted out under power frequency. Specifically:
(1) coexisting moment t, on the Traction networks that controller CU1 record feeder current mutual inductor CT detects, frequency is the electric current I of fM(x, t), makes current generator one CG1 absorption frequency be the electric current I of fFAnd make electric current IF(0, t)=electric current IM(x, t), the frequency on traction bus that recording voltage mutual inductor PT1 measures simultaneously is the voltage U of fF(0, t);
(2) coexisting moment t, controller CU1 receives the electric current I in moment t-�� T that controller CU2 is sent by internet ITM(x, t-�� T) and voltage UM(x, t-�� T) data, according to the feature of the maximum value in the current amplitude Changing Pattern that step (1) is arranged or minimum value, by electric current IM(x, t-�� T) and electric current IF(0, t-�� T) is synchronous: electric current IM(x, t-�� T)=IF(0, t-�� T); It is the voltage U of f according to frequency on the traction bus TB after synchronousFOn (0, t-�� T) and pantograph EB, frequency is the voltage U of fMDifference and the frequency of (x, t-�� T) are the electric current I of fF(0, t-�� T) calculates the impedance of the Traction networks under frequency f, then the impedance of the Traction networks converted out under power frequency.
Claims (2)
1. a Traction networks impedance online testing device, the Traction networks tested is made up of contact system T and rail R, and contact system T is connected with traction bus TB through feeder line F and feeder current mutual inductor CT; It is characterized in that: current generator one CG1 being arranged in Operation Van one comprises isolator K1, Current Transmit 1, PWM converter AD1, voltage transformer pt 1 and controller CU1, one end that wherein one end of isolator K1 exchanges port through Current Transmit 1 with PWM converter AD1 is connected, voltage transformer pt 1 is parallel on PWM converter AD1 port, the measuring junction of voltage transformer pt 1, the measuring junction of Current Transmit 1, the control end of PWM converter AD1 are connected with controller CU1, and controller CU1 is connected with internet IT; Current generator two CG2 being arranged in Operation Van two comprises pantograph EB, isolator K2, Current Transmit 2, PWM converter AD2, voltage transformer pt 2 and controller CU2, wherein pantograph EB, isolator K2, Current Transmit 2 are connected to one end that PWM converter AD2 exchanges port after connecting, voltage transformer pt 2 is parallel to PWM converter AD2 and exchanges on port, the measuring junction of voltage transformer pt 2, the measuring junction of Current Transmit 2, the control end of PWM converter AD2 are connected with controller CU2, and controller CU2 is connected with internet IT.
2. a kind of Traction networks impedance online testing device according to claim 1, it is characterised in that: described current generator one CG1 forms loop through traction bus TB, feeder line F, feeder current mutual inductor CT, contact system T and current generator two CG2 and rail R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520978354.3U CN205280823U (en) | 2015-12-01 | 2015-12-01 | Impedance of traction electric net work online test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520978354.3U CN205280823U (en) | 2015-12-01 | 2015-12-01 | Impedance of traction electric net work online test device |
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| Publication Number | Publication Date |
|---|---|
| CN205280823U true CN205280823U (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520978354.3U Withdrawn - After Issue CN205280823U (en) | 2015-12-01 | 2015-12-01 | Impedance of traction electric net work online test device |
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| CN (1) | CN205280823U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105353221A (en) * | 2015-12-01 | 2016-02-24 | 西南交通大学 | Traction network impedance on-line testing device and test method |
| CN111257688A (en) * | 2020-02-11 | 2020-06-09 | 西南交通大学 | Method for evaluating electrical performance of electrified railway contact net |
-
2015
- 2015-12-01 CN CN201520978354.3U patent/CN205280823U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105353221A (en) * | 2015-12-01 | 2016-02-24 | 西南交通大学 | Traction network impedance on-line testing device and test method |
| CN105353221B (en) * | 2015-12-01 | 2018-04-24 | 西南交通大学 | A kind of impedance of traction electric network online testing device and its test method |
| CN111257688A (en) * | 2020-02-11 | 2020-06-09 | 西南交通大学 | Method for evaluating electrical performance of electrified railway contact net |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160601 Effective date of abandoning: 20180424 |